I guess something like the Wireworld computer? (https://www.quinapalus.com/wires10.html https://www.quinapalus.com/wires10.html – another fascinating topic, by

I guess something like the Wireworld computer? (https://www.quinapalus.com/wires10.html https://www.quinapalus.com/wires10.html – another fascinating topic, by the way…) That one only uses MOVs, too, but the simulated CPU has a number of special registers implementing a number of basic operations, so instead of having to manually implement them the hard way using only MOVs (which in the particular case of the wireworld computer probably wouldn't even be possible due to its constrained resources and architecture), you can "cheat" by simply MOVing your operands into the respective special registers and then reading the result.